GeForce GT 220 GDDR3 vs Radeon HD 4650 512MB

Intro

Compare those specs to the Radeon HD 4650 512MB, which comes with a GPU core clock speed of 600 MHz, and 512 MB of DDR2 RAM running at 500 MHz through a 128-bit bus. It also is made up of 320(64x5) Stream Processors, 32 Texture Address Units, and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GT 220 GDDR3		58 Watts
	Difference: 3 Watts (5%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 220 GDDR3 should perform quite a bit faster than the Radeon HD 4650 512MB in general. (explain)

GeForce GT 220 GDDR3		32384 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 16384 (102%)

Texel Rate

The Radeon HD 4650 512MB will be a lot (about 92%) better at anisotropic filtering than the GeForce GT 220 GDDR3. (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
GeForce GT 220 GDDR3		10000 Mtexels/sec
	Difference: 9200 (92%)

Pixel Rate

If running with high levels of AA is important to you, then the GeForce GT 220 GDDR3 is the winner, but not by far. (explain)

GeForce GT 220 GDDR3		5000 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 200 (4%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.